<template>
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>权限管理</el-breadcrumb-item>
            <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图 -->
        <el-card>
            <!-- 添加角色按钮区域 -->
           <el-row>
                <el-col>
                    <el-button type="primary">添加角色</el-button>
                </el-col>
           </el-row>

           <!-- 角色列表区域 -->
           <el-table :data="rolelist" border stripe>
           <!-- 展开列 -->
           <el-table-column type="expand">
                <template slot-scope="scope">
                    <el-row :class="['bdbottom',i1 === 0 ? 'bdtop' : '','vcenter']" v-for="(item1, i1) in scope.row.children" :key="item1.id">
                        <!-- 渲染一级权限 -->
                        <el-col :span="5">
                                <el-tag
                                style="margin-right:0px"
                                closable
                                @close="removeRightById(scope.row, item1.id)">
                                     {{item1.authName}}
                                </el-tag>
                                <i class="el-icon-caret-right"></i>

                        </el-col>
                        <!-- 渲染二级和三级权限 -->
                        <el-col :span="19">
                            <!-- 通过 for循环 嵌套渲染二级权限 -->
                            <el-row :class="[i2 === 0 ? '' : 'bdtop','vcenter']" v-for="(item2, i2) in item1.children" :key="item2.id">
                                <el-col :span="6">
                                    <el-tag
                                    type="success"
                                    closable
                                    @close="removeRightById(scope.row, item2.id)">
                                     {{item2.authName}}
                                     </el-tag>
                                    <i class="el-icon-caret-right"></i>
                                </el-col>
                                <!-- 通过 for循环 嵌套渲染三级权限 -->
                                <el-col :span="18">
                                    <el-tag
                                        type="warning"
                                        v-for="(item3, i3) in item2.children "
                                        :key="item3.id"
                                        closable
                                        @close="removeRightById(scope.row, item3.id)">
                                        {{item3.authName}}
                                    </el-tag>
                                </el-col>
                            </el-row>
                        </el-col>
                    </el-row>
                    <!--<pre>
                        {{scope.row}}
                    </pre>-->
                </template>
           </el-table-column>
           <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="角色名称" prop="roleName"></el-table-column>
            <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
            <el-table-column label="操作" width="300px">
                <template slot-scope="scope">
                    <el-button type="primary" icon="el-icon-edit" size="mini">编辑</el-button>
                    <el-button type="danger" icon="el-icon-delete" size="mini">删除</el-button>
                    <el-button
                        type="warning"
                        icon="el-icon-setting"
                        size="mini"
                        @click="showSetRightDialog(scope.row)">
                            分配权限
                    </el-button>
                </template>
            </el-table-column>
           </el-table>
        </el-card>

        <!-- 分配权限的对话框 -->
        <el-dialog
            title="分配权限"
            :visible.sync="setRightDialogVisible"
            width="50%"
            @close="setRightDialogClosed">
            <!-- 树形控件 -->
            <el-tree
                :data="rightslist"
                :props="treeProps"
                show-checkbox
                node-key="id"
                default-expand-all
                :default-checked-keys="defKeys"
                ref="treeRef">
            </el-tree>
            <span slot="footer" class="dialog-footer">
                <el-button @click="setRightDialogVisible = false">取 消</el-button>
                <el-button
                type="primary" @click="allotRights">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>

export default {
  data () {
    return {
      // 所有角色列表数据
      rolelist: [],
      // 控制分配权限对话框的显示与隐藏
      setRightDialogVisible: false,
      // 所有权限的数据
      rightslist: [],
      // 树形控件的属性绑定对象
      treeProps: {
        children: 'children',
        label: 'authName'
      },
      // 默认选中的节点id值数组
      defKeys: [],
      // 当前即将分配权限的角色id
      roleId: ''
    }
  },
  created () {
    this.getRolesList()
  },
  methods: {
    // 获取所有角色的列表
    async getRolesList () {
      const { data: res } = await this.$http.get('roles')

      if (res.meta.status !== 200) {
        return this.$message.error('获取角色列表失败！')
      }
      this.rolelist = res.data
      console.log(this.rolelist)
    },
    // 根据 ID 删除对应的权限
    async removeRightById (role, rightId) {
      // 弹框提示用户是否要删除
      const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') {
        return this.$message.info('取消了删除！')
      }
      const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)

      if (res.meta.status !== 200) {
        return this.$message.error('删除角色权限失败！')
      }

      // this.getRolesList()
      role.children = res.data
    },
    // 展示分配权限的对话框
    async showSetRightDialog (role) {
      this.roleId = role.id
      // 获取所有权限的数据
      const { data: res } = await this.$http.get('rights/tree')

      if (res.meta.status !== 200) {
        return this.$message.error('获取权限数据失败！')
      }
      // 把获取到的权限数据保存到 data 中
      this.rightslist = res.data
      console.log(this.rightslist)

      // 递归获取三级节点的Id
      this.getLeafKeys(role,
        this.defKeys)

      this.setRightDialogVisible = true
    },
    // 通过递归的形式，获取角色下所有三级权限的id,并保存到 defKeys 数组中
    getLeafKeys (node, arr) {
      if (!node.children) {
        // 如果当前node节点不包含 children 属性,则是三级节点
        return arr.push(node.id)
      }

      node.children.forEach(item => {
        this.getLeafKeys(item, arr)
      })
    },
    // 监听分配权限对话框的关闭事件
    setRightDialogClosed () {
      this.defKeys = []
    },
    // 点击为角色分配权限
    async allotRights () {
      const keys = [
        this.$refs.treeRef.getCheckedKeys(),
        this.$refs.treeRef.getHalfCheckedKeys()
      ]

      const idStr = keys.join(',')

      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })

      if (res.meta.status !== 200) {
        return this.$message.error('分配权限失败！')
      }

      this.$message.success('分配权限成功！')
      this.getRolesList()

      this.setRightDialogVisible = false
    }
  }
}
</script>

<style lang="less" scoped>
.el-tag {
    margin: 7px;
}

.bdtop {
    border-top: 1px solid #eee
}

.bdbottom {
    border-bottom: 1px solid #eee
}

.vcenter {
    display: flex;
    align-items: center;
}

</style>>
